Alert archive / Minnesota / Polk County
Weather alerts in Polk County, Minnesota, 2016
153 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Polk County and its neighbors
Each county as a circle sized by its count in 2016. Tap one for its archive.
- Alerts
- 153
- Warnings
- 61
- Watches
- 19
- Advisories
- 44
- Busiest month
- July36 alerts
- Busiest day
- May 30, 201610 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
5 of 7 tornado warnings covering Polk County in 2016 had a tornado report inside them; 3 of 7 tornado reports fell inside a warning, on average 6 minutes after it went out.
Polk County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 7 | 5 | 29% | 7 | 43% | 6 min |
| Severe thunderstorm warnings | 31 | 27 | 13% | 27 | 78% | 21 min |
| Flash flood warnings | 3 | 3 | 0% | 4 | 100% | 67 min |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Grand Forks, ND: tornado warnings | 32 | 17 | 47% | 46 | 61% | 13 min |
| NWS Grand Forks, ND: severe thunderstorm warnings | 218 | 185 | 15% | 502 | 86% | 27 min |
| NWS Grand Forks, ND: flash flood warnings | 10 | 9 | 10% | 22 | 100% | 97 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
The alerts
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 6, 9:05 PM CST | Winter Weather Advisory | FGF | 15 hr |
| Jan 6, 10:08 PM CST | Winter Storm Warning | FGF | 14 hr |
| Jan 7, 12:29 PM CST | Winter Weather Advisory | FGF | 15 hr |
| Jan 8, 3:03 PM CST | Wind Chill Advisory | FGF | 45 hr |
| Jan 11, 2:28 PM CST | Wind Chill Advisory | FGF | 22 hr |
| Jan 14, 6:39 AM CST | Winter Weather Advisory | FGF | 14 hr |
| Jan 15, 3:53 AM CST | Wind Chill Advisory | FGF | 38 hr |
| Jan 16, 10:05 AM CST | Wind Chill Warning | FGF | 26 hr |
| Jan 16, 10:05 AM CST | Wind Chill Advisory | FGF | 50 hr |
| Jan 20, 5:08 AM CST | Freezing Rain Advisory | FGF | 7 hr |
| Jan 27, 8:55 AM CST | Wind Advisory | FGF | 6 hr |
| Jan 31, 3:43 AM CST | Dense Fog Advisory | FGF | 5 hr |
| Feb 5, 3:13 PM CST | Blizzard Watch | FGF | 23 hr |
| Feb 6, 2:37 PM CST | Blizzard Warning | FGF | 39 hr |
| Feb 6, 2:37 PM CST | Winter Storm Warning | FGF | 25 hr |
| Feb 6, 2:37 PM CST | Winter Weather Advisory | FGF | 51 hr |
| Feb 11, 3:19 PM CST | Wind Chill Advisory | FGF | 21 hr |
| Feb 12, 3:54 PM CST | Wind Chill Advisory | FGF | 18 hr |
| Feb 19, 8:35 AM CST | Dense Fog Advisory | FGF | 3 hr |
| Feb 28, 3:08 PM CST | Winter Weather Advisory | FGF | 12 hr |
| Mar 13, 9:59 PM CDT | Dense Fog Advisory | FGF | 12 hr |
| Mar 14, 10:05 AM CDT | Dense Fog Advisory | FGF | 115 min |
| Apr 1, 3:30 PM CDT | Wind Advisory | FGF | 12 hr |
| Apr 9, 4:01 AM CDT | Wind Advisory | FGF | 14 hr |
| May 2, 3:13 PM CDT | Fire Weather Watch | FGF | 14 hr |
| May 3, 5:41 AM CDT | Red Flag Warning | FGF | 14 hr |
| May 5, 12:22 PM CDT | Red Flag Warning | FGF | 9 hr |
| May 6, 3:42 AM CDT | Red Flag Warning | FGF | 15 hr |
| May 6, 3:26 PM CDT | Fire Weather Watch | FGF | 13 hr |
| May 7, 4:27 AM CDT | Red Flag Warning | FGF | 15 hr |
| May 9, 4:21 AM CDT | Red Flag Warning | FGF | 14 hr |
| May 13, 4:07 AM CDT | Freeze Warning | FGF | 29 hr |
| May 14, 4:01 AM CDT | Freeze Warning | FGF | 29 hr |
| May 14, 3:21 PM CDT | Frost Advisory | FGF | 18 hr |
| May 22, 10:50 PM CDT | Special Weather Statement | FGF | 55 min |
| May 22, 11:24 PM CDT | Severe Thunderstorm Warning | FGF | 52 min |
| May 30, 2:48 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 30, 3:57 PM CDT | Special Weather Statement | FGF | 33 min |
| May 30, 4:14 PM CDT | Severe Thunderstorm Warning | FGF | 28 min |
| May 30, 4:32 PM CDT | Severe Thunderstorm Warning | FGF | 31 min |
| May 30, 5:37 PM CDT | Special Weather Statement | FGF | 53 min |
| May 30, 5:40 PM CDT | Severe Thunderstorm Warning | FGF | 35 min |
| May 30, 5:50 PM CDT | Areal Flood Advisory | FGF | 3 hr |
| May 30, 6:16 PM CDT | Severe Thunderstorm Warning | FGF | 44 min |
| May 30, 6:19 PM CDT | Flash Flood Warning | FGF | 3 hr |
| May 30, 6:37 PM CDT | Mesoscale Discussion | SPC | 113 min |
| May 31, 12:49 AM CDT | Special Weather Statement | FGF | 56 min |
| Jun 10, 2:56 AM CDT | Severe Thunderstorm Warning | FGF | 49 min |
| Jun 10, 3:44 AM CDT | Severe Thunderstorm Warning | FGF | 46 min |
| Jun 17, 7:20 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 17, 7:32 AM CDT | Mesoscale Discussion | SPC | 28 min |
| Jun 17, 7:33 AM CDT | Severe Thunderstorm Warning | FGF | 57 min |
| Jun 17, 8:15 AM CDT | Severe Thunderstorm Warning | FGF | 60 min |
| Jun 17, 8:16 AM CDT | Areal Flood Advisory | FGF | 74 min |
| Jun 17, 8:59 AM CDT | Severe Thunderstorm Warning | FGF | 61 min |
| Jun 17, 9:03 AM CDT | High Wind Warning | FGF | 110 min |
| Jun 17, 9:05 AM CDT | Severe Thunderstorm Warning | FGF | 55 min |
| Jun 17, 9:52 AM CDT | Special Weather Statement | FGF | 38 min |
| Jun 17, 10:32 AM CDT | Special Weather Statement | FGF | 43 min |
| Jun 18, 5:06 AM CDT | Dense Fog Advisory | FGF | 4 hr |
| Jul 4, 1:34 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 4, 3:00 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 4, 5:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 4, 8:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 7, 3:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 7, 4:47 PM CDT | Tornado Warning | FGF | 43 min |
| Jul 7, 5:02 PM CDT | Tornado Warning | FGF | 43 min |
| Jul 7, 5:50 PM CDT | Severe Thunderstorm Warning | FGF | 25 min |
| Jul 7, 6:07 PM CDT | Areal Flood Warning | FGF | 3 hr |
| Jul 9, 5:27 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jul 9, 7:30 PM CDT | Severe Thunderstorm Warning | FGF | 60 min |
| Jul 9, 8:31 PM CDT | Severe Thunderstorm Warning | FGF | 44 min |
| Jul 9, 9:08 PM CDT | Severe Thunderstorm Warning | FGF | 52 min |
| Jul 10, 10:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 10, 10:40 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 11, 1:01 AM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 11, 1:06 AM CDT | Severe Thunderstorm Warning | FGF | 54 min |
| Jul 11, 2:01 AM CDT | Severe Thunderstorm Warning | FGF | 59 min |
| Jul 18, 3:17 PM CDT | Excessive Heat Watch | FGF | 36 hr |
| Jul 19, 5:45 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 19, 7:00 PM CDT | Severe Thunderstorm Warning | FGF | 60 min |
| Jul 19, 7:59 PM CDT | Severe Thunderstorm Warning | FGF | 61 min |
| Jul 19, 8:10 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 19, 8:31 PM CDT | Areal Flood Advisory | FGF | 89 min |
| Jul 19, 8:43 PM CDT | Severe Thunderstorm Warning | FGF | 62 min |
| Jul 19, 8:54 PM CDT | Tornado Warning | FGF | 36 min |
| Jul 20, 3:05 AM CDT | Excessive Heat Warning | FGF | 18 hr |
| Jul 20, 3:05 AM CDT | Heat Advisory | FGF | 18 hr |
| Jul 20, 8:41 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 20, 10:42 PM CDT | Severe Thunderstorm Warning | FGF | 48 min |
| Jul 20, 11:00 PM CDT | Severe Thunderstorm Warning | FGF | 45 min |
| Jul 20, 11:13 PM CDT | Severe Thunderstorm Warning | FGF | 62 min |
| Jul 20, 11:16 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jul 20, 11:26 PM CDT | Severe Thunderstorm Warning | FGF | 41 min |
| Jul 21, 12:03 AM CDT | Severe Thunderstorm Warning | FGF | 57 min |
| Jul 23, 12:48 PM CDT | Special Weather Statement | FGF | 27 min |
| Aug 1, 3:19 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 1, 6:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 3, 3:38 PM CDT | Tornado Watch | SPC | 7 hr |
| Aug 3, 9:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Aug 3, 10:22 PM CDT | Special Weather Statement | FGF | 53 min |
| Aug 3, 10:29 PM CDT | Severe Thunderstorm Warning | FGF | 61 min |
| Aug 3, 10:59 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 3, 11:01 PM CDT | Flash Flood Warning | FGF | 2 hr |
| Aug 10, 11:49 AM CDT | Flash Flood Watch | FGF | 16 hr |
| Aug 10, 8:00 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 10, 10:50 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Aug 23, 3:08 AM CDT | Severe Thunderstorm Warning | FGF | 52 min |
| Aug 27, 12:13 PM CDT | Areal Flood Advisory | FGF | 5 hr |
| Aug 27, 4:05 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 27, 4:54 PM CDT | Severe Thunderstorm Warning | FGF | 51 min |
| Aug 27, 5:31 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Aug 27, 5:41 PM CDT | Severe Thunderstorm Warning | FGF | 49 min |
| Aug 27, 6:26 PM CDT | Severe Thunderstorm Warning | FGF | 64 min |
| Aug 28, 5:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Aug 28, 7:48 PM CDT | Special Weather Statement | FGF | 42 min |
| Aug 28, 8:03 PM CDT | Tornado Warning | FGF | 27 min |
| Aug 28, 8:27 PM CDT | Tornado Warning | FGF | 33 min |
| Aug 28, 8:50 PM CDT | Tornado Warning | FGF | 25 min |
| Aug 28, 9:05 PM CDT | Severe Thunderstorm Warning | FGF | 40 min |
| Aug 28, 9:12 PM CDT | Tornado Warning | FGF | 48 min |
| Aug 28, 9:41 PM CDT | Areal Flood Advisory | FGF | 7 hr |
| Aug 28, 9:44 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Aug 28, 10:37 PM CDT | Flash Flood Warning | FGF | 10 hr |
| Sep 4, 8:18 PM CDT | Areal Flood Advisory | FGF | 6 hr |
| Sep 5, 2:27 AM CDT | Areal Flood Advisory | FGF | 5 hr |
| Sep 13, 3:48 AM CDT | Frost Advisory | FGF | 28 hr |
| Sep 25, 10:15 AM CDT | Wind Advisory | FGF | 9 hr |
| Oct 6, 3:00 PM CDT | Frost Advisory | FGF | 19 hr |
| Oct 7, 3:00 PM CDT | Freeze Warning | FGF | 19 hr |
| Oct 8, 2:48 PM CDT | Frost Advisory | FGF | 17 hr |
| Oct 9, 12:38 PM CDT | Wind Advisory | FGF | 6 hr |
| Nov 14, 9:01 AM CST | Dense Fog Advisory | FGF | 119 min |
| Nov 16, 4:01 AM CST | Winter Storm Watch | FGF | 33 hr |
| Nov 17, 1:04 PM CST | Winter Weather Advisory | FGF | 29 hr |
| Nov 21, 3:29 PM CST | Winter Weather Advisory | FGF | 28 hr |
| Nov 22, 1:50 AM CST | Mesoscale Discussion | SPC | 115 min |
| Nov 26, 3:15 PM CST | Dense Fog Advisory | FGF | 27 hr |
| Dec 5, 3:58 AM CST | Winter Storm Warning | FGF | 39 hr |
| Dec 5, 3:58 AM CST | Winter Weather Advisory | FGF | 65 hr |
| Dec 5, 3:27 PM CST | Blizzard Warning | FGF | 39 hr |
| Dec 5, 4:55 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 9, 2:59 PM CST | Wind Chill Advisory | FGF | 21 hr |
| Dec 12, 3:28 PM CST | Wind Chill Advisory | FGF | 19 hr |
| Dec 13, 2:54 PM CST | Wind Chill Advisory | FGF | 45 hr |
| Dec 16, 4:15 AM CST | Wind Chill Warning | FGF | 56 hr |
| Dec 18, 12:00 PM CST | Wind Chill Advisory | FGF | 3 hr |
| Dec 22, 3:45 PM CST | Blizzard Watch | FGF | 24 hr |
| Dec 22, 3:45 PM CST | Winter Storm Watch | FGF | 3 days |
| Dec 23, 3:41 PM CST | Blizzard Warning | FGF | 3 days |
| Dec 24, 4:16 AM CST | Winter Storm Warning | FGF | 56 hr |
| Dec 25, 5:13 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 26, 12:21 AM CST | Winter Weather Advisory | FGF | 19 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20152017
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.